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pressure control · instrument loop

Gas Header Pressure Control Loop

This diagram shows a pressure-control loop on a compressed-gas header. Gas enters the compressor and passes through PV-101 before entering the downstream header. PT-101 measures that header pressure and sends an electric signal to PIC-101. The controller sends a pneumatic signal to the diaphragm-operated control valve, adjusting inlet flow to maintain its pressure setpoint. PSV-101 is shown separately as an independent protection device. If pressure exceeds its set pressure, it relieves to the designated safe vent rather than relying on the normal control valve. The drawing distinguishes control from pressure relief and is useful for a design discussion or loop check. A completed project must confirm gas properties, relief sizing, vent destination, materials, and applicable safety requirements.

Tipo P&IDNorma ANSI/ISA-5.1-2009 + ISO 10628-1:2014Motor schematex-pidActualizado 24/9/2026
Process Control
Gas Header Pressure Control
Drawing preview
La solicitud

“A gas header pressure control loop: a compressor feeds PV-101, PT-101 measures downstream header pressure, PIC-101 controls the fail-closed valve, and PSV-101 relieves the header to a safe vent at 10 barg.”

Entonces pruebaAdd a high-pressure alarm on the headerChange the relief set pressure to 12 barg
Qué hay en este dibujo

Lee las decisiones que hay detrás.

01Measurement

PT-101 senses pressure downstream of PV-101.

02Control

PIC-101 modulates the inlet control valve.

03Protection

PSV-101 relieves independently to the safe vent.

04Fail state

PV-101 closes on loss of actuator air.

Use this pattern for a basic regulated gas header; review relief sizing and setpoints for the actual service.

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Preguntas frecuentes

Preguntas habituales

What does PIC-101 do?

It adjusts PV-101 to maintain the gas-header pressure setpoint.

Why is a PSV separate from the control loop?

The relief valve provides independent protection if normal pressure control cannot contain overpressure.

What does fail closed mean?

PV-101 moves closed if it loses actuator air.